This reliable nitrogen oxide sensor acts as a vital part of engine post-processing systems. It keeps checking NOx concentration inside exhaust gas in real time, and delivers accurate data to vehicle electronic control modules. It assists the whole emission system to finish effective purification work, so as to meet standard exhaust discharge requirements. Adopting premium heat-resistant materials and integrated sealing structure, it can endure long-term high-temperature impact and maintain steady working performance, which is suitable for daily engine maintenance and accessory replacement.